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Finding the Fourth Proportional to 1,239.98, 1,860.15 and 418.05

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Solution

The fourth proportional to 1,239.98, 1,860.15 and 418.05 is: 627.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.98 : 1,860.15 = 418.05 : x
  2. Step 2: Convert to fraction form
    1,239.98/1,860.15 = 418.05/x
  3. Step 3: Cross multiply
    1,239.98x = 1,860.15 × 418.05
  4. Step 4: Simplify right side
    1,239.98x = 777,635.71
  5. Step 5: Solve for x
    x = 777,635.71/1,239.98
  6. Step 6: Final answer
    x = 627.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.